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| Number | Title | Issue Date |
| 7899858 | Filter circuit The present invention provides a filter circuit which can eliminate single noise effectively and is relatively simple in circuit configuration. First and second absolute values of differences between one-clock-preceding output data and both of one-clock-preceding in... | 03/01/2011 |
| 7660839 | Digital filter having improved overload recovery characteristics A digital filter having improved overload characteristics provides improved performance in audio equalizers and other systems. In contrast to a standard digital filter, clipping is enforced at the output of the filter and an integrator is used to implement the first... | 02/09/2010 |
| 7636747 | Digital low-pass filter A digital low-pass filter includes: a first subtracter that subtracts a first feedback term from an input; a first multiplier that multiplies an first subtracter output by a constant k1; a first delay unit that delays an input by a predetermined sampling ... | 12/22/2009 |
| 7603400 | Method and system for filter loop with saturation Methods and systems for processing a signal are disclosed herein and may comprise filtering an input signal and a plurality of saturation limit signals to generate a plurality of filtered input signals. A plurality of summed current input signals may be generated by... | 10/13/2009 |
| 7552157 | Broad-dynamic filtering procedure for a recursive digital filter installed in a signal processor (DSP) operating with integers The present invention relates to a filtering procedure for recursive digital filters installed in signal processors (DSP) operating with integers. It comprises two calculation procedures coupled with the classical calculation procedure of a recursive filter, the fir... | 06/23/2009 |
| 7483931 | Signal generator using IIR type digital filter; and method of generating, supplying, and stopping its output signal A signal generator using an IIR type digital filter (recursive type digital filter) having multipliers A and B in a feedback loop. A control unit 2 provided for the signal generator sets and changes coefficients of the multipliers A and B and generates, suppl... | 01/27/2009 |
| 7415542 | Micro-programmable filter engine having plurality of filter elements interconnected in chain configuration wherein engine supports multiple filters from filter elements A micro-programmable filter (MFE) engine includes multiple programmable filter elements and a microcode controller. The filter elements can be configured, controlled, and combined in different ways to implement different types of filters. The MFE preferably supports... | 08/19/2008 |
| 7406493 | Up-sampling half-band reconstruction filtering An up-sampled half band reconstruction filter has a seagull architecture in the form of a pair of parallel infinite impulse response (IIR) filters, one receiving as an input an input signal delayed by one sample time and the other receiving as an input a reverse ver... | 07/29/2008 |
| 7363334 | Digital signal-processing structure and methodology featuring engine-instantiated, wave-digital-filter componentry, and fabrication thereof Digital signal-processing structure and methodology which feature a time-slice-based digital fabricating engine, and software operating structure operatively associated with that engine structured to operate the engine in a time-slice-based fabrication mode wherein ... | 04/22/2008 |
| 7353243 | Reconfigurable filter node for an adaptive computing machine A reconfigurable filter node including an input data memory adapted to store a plurality of input data values, a filter coefficient memory adapted to store a plurality of filter coefficient values, and a plurality of computational units adapted to simultaneously com... | 04/01/2008 |
| 7353245 | Adaptive filter coefficient determination Operation of an adaptive filter includes determining a first filter coefficient and determining a second filter coefficient based on the first filter coefficient, in one embodiment, and in another embodiment includes comparing pseudo-error counts generated for each ... | 04/01/2008 |
| 7346639 | Method and apparatus for suppressing limit cycles in noise shaping filters Harmonic interference caused by limit cycles occurs in the resultant signals of filters for noise conversion as a consequence of limit cycles. A feedback loop is connected downstream of the actual filter and is used to effectively suppress the limit cycles. A feedba... | 03/18/2008 |
| 7334010 | Feedback digital filter A digital filter includes a data storage section, a filter coefficient storage section, a multiplier, an accumulative adder section, a data output section and a control section. The data storage section stores the latest multiple input data for every channel and out... | 02/19/2008 |
| 7327658 | Wobble signal processing apparatus The present invention is made to improve the conventional analog processing that is easily affected by variations in semiconductor processing. This invention provides a wobble signal processing apparatus that can reduce the circuit scale and the power consumption as... | 02/05/2008 |
| 7290022 | Method and filter arrangement for digital recursive filtering in the time domain A method and apparatus for fast digital filtering that requires only filter stages of first and second order. A desired rational filter transfer function is represented as a sum of first and second order intermediate transfer functions. A time dependent input signal... | 10/30/2007 |
| 7287050 | Parametric recursive digital filter A digital filter includes a delay network with a plurality of delay elements configured and arranged as all-pass filters, having a controllable coefficient value. In the case of a low-pass or high pass filter, the cut-off frequency of the filter can be controlled vi... | 10/23/2007 |
| 7280135 | Pixel array, image sensor having the pixel array and method for removing flicker noise of the image sensor There are provided a pixel array capable of detecting and removing a flicker noise, an image sensor employing the pixel array and an automatic flicker noise detecting method capable of effectively detecting and removing the flicker noise of the image sensor. For the... | 10/09/2007 |
| 7277907 | Method of setting a transfer function of an adaptive filter A method of setting a transfer function of an adaptive filter. The adaptive filter is used for processing an audio signal. The method includes setting a first, a second, and a third pole, setting a first zero without resting upon the audio signal. A real part of the... | 10/02/2007 |
| 7251274 | Multichannel adaptive equaliser An equalizer device is used for digital communications systems having a plurality of receive channels. The equalizer device in normal operation comprises a transversal filter for each receive channel, an adder for summing the receive channels, and a system downstrea... | 07/31/2007 |
| 7222144 | Weight measurement apparatus, method of eliminating noise and method of designing digital filter A filtering technique which makes it possible to easily and appropriately eliminate a noise without increasing a scale of a circuit necessary for a filtering process even if a noise frequency is liable to be changed is provided. A filter coefficient calculator (6... | 05/22/2007 |
| 7197522 | Bi-quad digital filter configured with a bit binary rate multiplier The invention is directed to a bi-quad filter circuit configured with sigma-delta devices that operate as binary rate multipliers (BRMs). Unlike conventional bi-quad filter circuits, the invention provides a bi-quad filter configured with a single-bit BRM. In anothe... | 03/27/2007 |
| 7191025 | Variable digital high and low pass filters A system (10) for providing an integer number N of filters. The system comprises an input (Di) for receiving a digital audio signal and an output (Do) for providing a filtered audio signal. The system also comprises circuitry (16)... | 03/13/2007 |
| 7190294 | Jointly nonlinear delta sigma modulators A signal processing system includes a jointly non-linear delta sigma modulator. In one embodiment, the jointly non-linear delta sigma modulator includes a non-linear quantization transfer function, and the output of the delta sigma modulator is defined, at least in ... | 03/13/2007 |
| 7187312 | Look-ahead delta sigma modulator having an infinite impulse response filter with multiple look-ahead outputs A delta sigma modulator look-ahead IIR filter response can be divided into a natural response and a pattern response using superposition techniques. The look-ahead delta sigma modulators of the signal processing systems described herein include an infinite impulse r... | 03/06/2007 |
| 7185036 | Look up table based upsampling and digital filtering A system and method are disclosed for processing a signal that includes receiving encoded data including a plurality of input symbols; generating an input symbol set from the plurality of input symbols; looking up a plurality of output samples for the input symbol s... | 02/27/2007 |
| 7162506 | Integrated circuit with mode control for selecting settled and unsettled output from a filter In a signal processing integrated circuit having an analog to digital converter and a digital filter having a plurality of taps separated in time, when starting a conversion after a reset or a change of input channel, the filter will have an incomplete set of input ... | 01/09/2007 |
| 7159002 | Biquad digital filter operating at maximum efficiency An architecture for a biquad (70), second-order infinite impulse response (IIR) digital filter, that is capable of operating at maximum efficiency, is disclosed. The biquad (70) includes coefficient memory (50) and data memory (52), along... | 01/02/2007 |
| 7155446 | Performing recursive database operations A method and apparatus for performing recursive database operations is provided. According to one aspect, a plurality of first-stage slaves and a plurality of second-stage slaves are established in a database server. During one or more iterations of a recursive data... | 12/26/2006 |
| 7152084 | Parallelized infinite impulse response (IIR) and integrator filters A digital parallelized Infinite Impulse Response (IIR) integrator filter comprising a first channel having a first input and second channel having a second input, a first adder to add the two channel inputs, an integrator to integrate the added channel inputs to pro... | 12/19/2006 |
| 7148830 | Look-ahead delta sigma modulator with pruning of output candidate vectors using quantization error minimization pruning techniques A look-ahead delta sigma modulator utilizes pruning techniques to reduce the number of possible output candidate vectors used to determine quantization output values. The look-ahead delta-sigma modulators can also combine the pruning techniques with a reduction in t... | 12/12/2006 |
| 7138934 | Pattern biasing for look-ahead delta sigma modulators Look-ahead delta sigma modulators of a signal processing system can selectively bias one or more output candidate vectors to alter the probability of selecting a biased output candidate vector(s) for determination of a quantization output value. The probability, wit... | 11/21/2006 |
| 7139326 | Image-canceling quadrature modulator and method Canceling images in a quadrature modulator includes frequency shifting the baseband signal and images; filtering the frequency shifted baseband signal and images; phase and frequency shifting the baseband signal and images; filtering the phase and frequency shifted ... | 11/21/2006 |
| 7130875 | Digital filter coefficient setting apparatus and digital filter coefficient setting method Herein disclosed is a digital filter coefficient setting apparatus which can search and select a specified filter coefficient element corresponding to a specified coefficient parameter inputted by a parameter inputting unit from among the plurality of filter coeffic... | 10/31/2006 |
| 7130876 | Systems and methods for efficient quantization A method in a signal processor for quantizing a digital signal is provided. A fixed-point approximation of a value X÷Q is generated, wherein X is a fixed-point value based on one or more samples in the digital signal, and wherein Q is a fixed-point quantization par... | 10/31/2006 |
| 7124298 | Method and device for detecting a watermark Method of and system for detecting a watermark in MPEG-2 encoded video data during high-speed copying of the video data. A bus spy (120) selects independently coded frames, such as I-frames, from the video data and feeds the selected frames to a watermark det... | 10/17/2006 |
| 7096244 | Digital filter and reference signal cancelling device and method using the same A second-order bandpass IIR type digital filter, assuming that a sampling frequency is six times as large as a central frequency of a passing frequency band, a first-order input feedback coefficient b1 is set at −1+2−n and a second-order input ... | 08/22/2006 |
| 7084798 | Look-ahead delta sigma modulators with quantizer input approximations A signal processing system includes a look-ahead delta sigma modulator having an approximation generator to approximate quantizer input signals. A look-ahead delta-sigma modulator can be implemented as a noise shaping filter and a quantizer. The quantizer can be imp... | 08/01/2006 |
| 7081843 | Overload protection for look-ahead delta sigma modulators Look-ahead delta sigma modulators of the signal processing systems described herein can anticipate quantizer overload. By anticipating quantizer overload, the look-ahead delta sigma modulators can select an output value y(n) that may have a lower SNR but will preven... | 07/25/2006 |
| 7062521 | Digital base booster using arithmetic processor A digital base booster (DBB) for reducing hardware by using an arithmetic processor is provided. Instead of using a conventional IIR filter having a cascade structure including a plurality of partial building blocks, the digital base booster using an arithmetic proc... | 06/13/2006 |
| 7062635 | Processor system and method providing data to selected sub-units in a processor functional unit A processor (50) operable in response to an instruction set comprising a plurality of instructions. The processor comprises a functional unit (52) comprising an integer number S of sub-units (541, 542, 54... | 06/13/2006 |
